Petee sweeney



P. SWEENEY. Fire Grate.

No. 230,906. Patented Aug.10,1s80.

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@u WMM lull Il n umm iii vNrrnn APFENT PETER SVEENEY, OF NEV YORK, N. Y.

FlRE-GRATE.

' SPECIFICATION forming part of Letters Patent No. 230,906, dated August 1o, 1880.

Application tiled December l?, 1879.

To all whom tt may concern Be it known that I, PETER SWEENEY, of the city, county, and State of New York, have invented a new and useful Improvement. in Fire-Grates, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure 1 represents a cross-section of a grate embodying my invention. Fig. 2 is a plan or top view thereof. Fig. 3 is a horizontal section of one ofthe grate-bars,taken in the plane of the line x, Fig. 4, Fig. 4 is a longitudinal vertical section of the same, taken in the plane y y, Fig. 3.

Similar letters indicate corrcspondin g parts.

My invention relates especially to that class of fire-grates used for burning fine coal or coaldust 5 and it consists in a grate embodying a series of hollow prismatic hars, which are adapted to admit air and are equipped with laterally :projecting nipples or corrugations, whereby the air escapes from the interior of the bars to support combustion, and the fuel resting on the grate is prevented from packing` closely together. The interiorof the gratebars is divided into a series of air-chambers for the purpose of insuring a uniform or steady dow of air therefrom to the mass of fuel resting on the grate. The sides of the grate-bars are constructed of detached tiles cast with the nipples or corrugations, so that if a portion of either of the bars burns out it can be renewed without disturbing the remainder of the grate. The respective grate-bars are provided with an air gate or damper and with an air-supply pipe, so that the draft can be regulated, and, if the natural draft is insufficient7 air can be injected by a suitable blast apparatus.

In the drawings, the letter A designates the bars of a fire-grate. These bars are hollow and are open on thc bottom for the admission of air thereto, while they arc respectively provided with a series of perforated nipples or corrugations, which project therefrom in a lateral direction. bars A issues from the nipples or corrugations B, so as to support combustion of the fuel resting on the grate, while the nipples or corruga tions serve to keep the fuel loose on the grate,

The air admitted to the grate? and thus allow the use of fine coal or coaldust.

The nipples or corrugations B may be arranged in various ways and made of various shapes, while their pcrforations may be arranged simply in the ends or also in the sides thereof. The effect-of the nipples or corrugations B may beincreased by making the same of an incandescent material.

Between the bars are gratings O for thc escape of ashes.

Within the bars A are partitions running both in a longitudinal and transverse direction, as shown, whereby the bars are divided into a series of air-chambers, c, in which the air admitted to the bars is distributed, so that the flow of air through and from the bars is uniform or steady. The partitions named are preferably arranged in the upper portions of the bars A, leavinga space, d, beneath them for the distribution of air.

The opposite sides of the bars A consist of detached tiles F, which are cast with the nipples or corrugations B, and are set in rabbets or grooves g,`formed in the bars at appropriate points. By this construction of the bars A portions thereof can be renewed when burned outwithout disturbing the remainder of the grate.

I usually perforate the tiles F between the nipples or corrugations B to increase the draft of air from the bars.

In the bottom of the bars A, Where they are open, as before stated, is arranged a gate or damper, H. This gate is arranged to slide in guide-grooves t' in the bars, and is operated by a rod, j, projecting from the bars at one end. By this gate or damper the draft of air through the bars A can be controlled with nicety.

To one end of the barsA is connected a pipe, Z, which is adapted to connect with a fanblower or other air-forcing device, so that, if found expedient, a blast of air can be injected into the bars, the damper H being in that case closed.

What I claim as new, and desire to secure by Letters Patent, is-

l. A fire-grate embodying a series of hollow prismatic grate-bars which are adapted to ad- IOO mit air, and provided -with laterally-projecting perforated nipples or oorrugations, substantially as and for the purpose described.

2. A fire-grate embodying a series of hollow prismatic grate-bars which 'are adapted to admit air, and divided into a series of air-chambers, and provided with laterally-proieeting perforated nipples or oorrugatious, substantially as and 'for the purpose described.

3. A fire-grate embodying a series of hollow prismatic grate-bars which are adapted to admit air7 and the sides of'wliich are constructed of detached tiles cast with perforated nipples or corrugations, substantially as and for the purpose described.

4. A fire-grate embodying a series of hollow prismatic grate-bars which are adapted to adhave hereunto set my hand and seal this 15th day of December, 1879.

PETER SWEENEY.

Witnesses:

(J1-ms. WAHLERS, J. VAN SAN'rvooD. 

